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50acfb2b | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
e2c0cdfb PD |
2 | /* |
3 | * Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved. | |
4 | * Copyright 2010 Tilera Corporation. All Rights Reserved. | |
5 | * Copyright 2015 Regents of the University of California, Berkeley | |
6 | * | |
e2c0cdfb PD |
7 | * See asm-generic/syscall.h for descriptions of what we must do here. |
8 | */ | |
9 | ||
10 | #ifndef _ASM_RISCV_SYSCALL_H | |
11 | #define _ASM_RISCV_SYSCALL_H | |
12 | ||
efe75c49 | 13 | #include <uapi/linux/audit.h> |
e2c0cdfb PD |
14 | #include <linux/sched.h> |
15 | #include <linux/err.h> | |
16 | ||
17 | /* The array of function pointers for syscalls. */ | |
e6a30224 | 18 | extern void * const sys_call_table[]; |
e2c0cdfb PD |
19 | |
20 | /* | |
21 | * Only the low 32 bits of orig_r0 are meaningful, so we return int. | |
22 | * This importantly ignores the high bits on 64-bit, so comparisons | |
23 | * sign-extend the low 32 bits. | |
24 | */ | |
25 | static inline int syscall_get_nr(struct task_struct *task, | |
26 | struct pt_regs *regs) | |
27 | { | |
28 | return regs->a7; | |
29 | } | |
30 | ||
e2c0cdfb PD |
31 | static inline void syscall_rollback(struct task_struct *task, |
32 | struct pt_regs *regs) | |
33 | { | |
34 | regs->a0 = regs->orig_a0; | |
35 | } | |
36 | ||
37 | static inline long syscall_get_error(struct task_struct *task, | |
38 | struct pt_regs *regs) | |
39 | { | |
40 | unsigned long error = regs->a0; | |
41 | ||
42 | return IS_ERR_VALUE(error) ? error : 0; | |
43 | } | |
44 | ||
45 | static inline long syscall_get_return_value(struct task_struct *task, | |
46 | struct pt_regs *regs) | |
47 | { | |
48 | return regs->a0; | |
49 | } | |
50 | ||
51 | static inline void syscall_set_return_value(struct task_struct *task, | |
52 | struct pt_regs *regs, | |
53 | int error, long val) | |
54 | { | |
55 | regs->a0 = (long) error ?: val; | |
56 | } | |
57 | ||
58 | static inline void syscall_get_arguments(struct task_struct *task, | |
59 | struct pt_regs *regs, | |
e2c0cdfb PD |
60 | unsigned long *args) |
61 | { | |
b35f549d SRRH |
62 | args[0] = regs->orig_a0; |
63 | args++; | |
64 | memcpy(args, ®s->a1, 5 * sizeof(args[0])); | |
e2c0cdfb PD |
65 | } |
66 | ||
67 | static inline void syscall_set_arguments(struct task_struct *task, | |
68 | struct pt_regs *regs, | |
e2c0cdfb PD |
69 | const unsigned long *args) |
70 | { | |
32d92586 SRV |
71 | regs->orig_a0 = args[0]; |
72 | args++; | |
73 | memcpy(®s->a1, args, 5 * sizeof(regs->a1)); | |
e2c0cdfb PD |
74 | } |
75 | ||
16add411 | 76 | static inline int syscall_get_arch(struct task_struct *task) |
efe75c49 DA |
77 | { |
78 | #ifdef CONFIG_64BIT | |
79 | return AUDIT_ARCH_RISCV64; | |
80 | #else | |
81 | return AUDIT_ARCH_RISCV32; | |
82 | #endif | |
83 | } | |
84 | ||
e2c0cdfb | 85 | #endif /* _ASM_RISCV_SYSCALL_H */ |